Yeah I don't know but for some reason it slowed me way down, I didn't think the hand over before hitting the check button. With the quality of hands that this guy had shown down to this point were any indication, he would be incapable of checking the nuts on the river, so it would have been a safe bet. Even though I won a decent sized pot (for the stakes) I realized that I had totally butchered the hand. Thanks for the advice and analysis, everybody.